[danbruc]

According to Wikipedia [1] jet fuel has 43 MJ/kg and lithium ion batteries with silicon nanowire anode have 1.566 MJ/kg. With that you get get 714 kg of batteries for 26 kg of jet fuel. The Tesla Model S 85 kWh battery has 0.57 MW/kg [2] which gives 1961 kg. Looking only at the energy density, the numbers from the article seem quite optimistic for the battery weight, but it is not clear what they actually calculated and I guess their numbers might contain factors accounting for efficiency. Do they account for the difference in weight, of the energy source and energy conversion mechanism, 26 kg vs 600 kg is nothing were I would expect similar performance?

[1] https://en.wikipedia.org/wiki/Energy_density

[2] https://en.wikipedia.org/wiki/Tesla_Model_S#Battery

[schiffern]

>The Tesla Model S 85 kWh battery has 0.57 MW/kg [2]

Note that your source is from 2015. The Model S battery of today has a higher capacity (100 kWh) and has undergone constant lightweighting improvements.

[danbruc]

This article [1] says that it is now 0.65 MW/kg which is a 15 % improvement.

[1] https://www.teslaoracle.com/2022/02/18/model-s-plaid-battery...

[nimos]

Electric->Mechanical is much more efficient than Fuel->Mechanical so that is probably where the difference is coming from.